// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/at_exit.h"
#include "base/bind.h"

#include "testing/gtest/include/gtest/gtest.h"

namespace {

int g_test_counter_1 = 0;
int g_test_counter_2 = 0;

void IncrementTestCounter1(void* unused)
{
    ++g_test_counter_1;
}

void IncrementTestCounter2(void* unused)
{
    ++g_test_counter_2;
}

void ZeroTestCounters()
{
    g_test_counter_1 = 0;
    g_test_counter_2 = 0;
}

void ExpectCounter1IsZero(void* unused)
{
    EXPECT_EQ(0, g_test_counter_1);
}

void ExpectParamIsNull(void* param)
{
    EXPECT_EQ(static_cast<void*>(NULL), param);
}

void ExpectParamIsCounter(void* param)
{
    EXPECT_EQ(&g_test_counter_1, param);
}

} // namespace

class AtExitTest : public testing::Test {
private:
    // Don't test the global AtExitManager, because asking it to process its
    // AtExit callbacks can ruin the global state that other tests may depend on.
    base::ShadowingAtExitManager exit_manager_;
};

TEST_F(AtExitTest, Basic)
{
    ZeroTestCounters();
    base::AtExitManager::RegisterCallback(&IncrementTestCounter1, NULL);
    base::AtExitManager::RegisterCallback(&IncrementTestCounter2, NULL);
    base::AtExitManager::RegisterCallback(&IncrementTestCounter1, NULL);

    EXPECT_EQ(0, g_test_counter_1);
    EXPECT_EQ(0, g_test_counter_2);
    base::AtExitManager::ProcessCallbacksNow();
    EXPECT_EQ(2, g_test_counter_1);
    EXPECT_EQ(1, g_test_counter_2);
}

TEST_F(AtExitTest, LIFOOrder)
{
    ZeroTestCounters();
    base::AtExitManager::RegisterCallback(&IncrementTestCounter1, NULL);
    base::AtExitManager::RegisterCallback(&ExpectCounter1IsZero, NULL);
    base::AtExitManager::RegisterCallback(&IncrementTestCounter2, NULL);

    EXPECT_EQ(0, g_test_counter_1);
    EXPECT_EQ(0, g_test_counter_2);
    base::AtExitManager::ProcessCallbacksNow();
    EXPECT_EQ(1, g_test_counter_1);
    EXPECT_EQ(1, g_test_counter_2);
}

TEST_F(AtExitTest, Param)
{
    base::AtExitManager::RegisterCallback(&ExpectParamIsNull, NULL);
    base::AtExitManager::RegisterCallback(&ExpectParamIsCounter,
        &g_test_counter_1);
    base::AtExitManager::ProcessCallbacksNow();
}

TEST_F(AtExitTest, Task)
{
    ZeroTestCounters();
    base::AtExitManager::RegisterTask(base::Bind(&ExpectParamIsCounter,
        &g_test_counter_1));
    base::AtExitManager::ProcessCallbacksNow();
}
